Market size prediction
 

Does anyone know of a model for predicting market size at close time, using only data such as prize money, venue, and class? Or are there any analysis services that provide this? By market size I mean the Betfair traded volume or the win pool size when the race jumps.

I am trying to size my bets to match the expected liquidity, so this prediction would be helpful. Anything you are willing to share is appreciated.